Shuttle-box tension-controlling mechanism for looms



c. H. DRAPE SHUTTLE BOX TENSION CONTROLLING MECHANISM FOR LOOMS FiledJuly 11, 1922 2 sheets sheei; l

Dec. 4 1923. C. H. DRAPER SHUTTLE BOX TENSION CONTROLLING MECHANISM FORLOOMS Filed July 11. 1922 2 Sheets-Sheet 2 SHUTTLE SHUTTLE PICKED BOXEDFRONT TOP BACK BOTTOM FRONT CENTER CENTER CENTER CENTER CENTER JWWWWDec. 5-, IlilZZPa.

fir t 1 hil s ni rates.

CLJI-tRE H. DRAPER, QF HOPEDALE, MASEACHUSETTS, ASSICHQ GR TO HGPEDA'LEMAINE FACTUBING COIKEAN'EI, i? MILFGRD, MASSACHUSETTfi A CORPORATION (35LEAS- SACH'USETTS.

Application filed July 11,

To cZlwhom it may concern:

it known that I, CLARE H. DRAPER, a. citizen of the United States,residing at Hopedale, in the county of Worcester and State ofMassachusetts, have invented certain new and useful Improvements inShuttle-Box 'lension-(ontrolling Mechanism for Looms; and Idohereby'declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled. in the art towhich it appen tains to make and use the same.

The present invention relates to an improvement in shuttle box tensioncontrolling mechanism for looms.

It has been proposed to provide a loom with mechanism for varying theresistance of theshuttle box to the entrance of the shuttle by the useor a cam and connections operating a the lay moves back and during thetime the shuttle is to start on its excursion, so that the pressure onthe shuttle at first least, and then gradually in" creases until itreaches a. maximum at the rear position of the lay. then graduallybecoming less and less during the forward movement of the lay until atthe expiration of the time when the shuttle must have completed itsXCHTSlO1l the shuttle is held in the box by the ight pressure of thebinder, so that when the shuttle is finally boxed it is lightly held. insuch construction the binder lever forming part of the protectormechanism was provided with a roll to engage a cam supported on the loomframe the contour of which with relation to thenormal path of motion ofthe roll was such as to secure the results stated.

The object of the present invention is to produce an improvedconstruction of mechanisni for controlling the shuttle box resistanceduring the movements of the lay, and to this end the present inventionconsists in the shuttle box tension controlling mechenism hereinafterdescribed and particularly defined in the claims.

in the accompanying drawings illustrat ing the preferred form of theinvent-ion, Fig. [is an end elevation of s loom wit-lithe shuttle boxshown in section; Fig. 2 is a plan of the shuttle box; Fig. 3 is adetail hereinafter referred to; and i is a diagram hereinafter referredto.

The illustrated embodiment of the 1822. aerial 1%. W431i.

tion is described as follows: The 1 f. actuated by the pitrnan 2connected to the crank 3 of the lay shaft l, are of the usualconstruction. The front 5 of the shuttle box is fixed, and the binder 6pivoted at '2' comprises the rear of the shuttle box. The shuttle 8 isshown in the box. To the rear of the binder G is attached s clevis 9, to

which the eye 10 of the rod 11 is secured by.

leased. The forward. end of the sleeve 14;

is provided with two inwardly projecting teeth 17 which-engage thespring 18. This spring, 18 encircles the rod 11, and. at its forward endtakes against the washer 19, which is secured in place by a nut 20 andlock'nut- 21, which provide a second means for adjusting the pressureexerted by the spring. The other means for adjusting the pressureexerted by the spring is the rotatable sleeve 14. By screwing the sleeveup the spring less pressure will be exerted by the spring on the rod,and therefore less pressure will be exerted on the binder 6.

It will be observed that with a given position of the sleeve 14 on thespring 18, an adjustment of the set nuts 20--21 may be made to determinethe pressure exerted by the binder on the shuttle. With such ad"justincnt there will be acertain length of spring in use. N ow retainingthe front adjustment fixed, by screwing the sleeve 1d up the spring andmoving such sleeve forward in the bracket 13 to the extent to which itis screwed upon the spring, a less length of spring may be employed andwith the same pressure exerted on the binder at its forward position thepressure on. the binder will be greater in the rearward josition of thelay because a shorter lengt of spring will have been compressed. The twoadjustments therefore. are used, the front adjustment to regulatetheminimum pres sure on the binder (that is while the lay IS in its forwardposition) and the rear ad-' justinent to regulate the length of springto be employed. It will be apparent that in ile this Way with a givenpressure on the lay in forward position, the pressure on the binderzit-rearward position may be made greater oriess without change of thepressure at the forward position, and vice versa.

The pick of the shuttle takes place on the brick stroke of the lay itthe top center and the earliest that the shuttle can box is at the backcenter, so that the position of the laydetermines the tension on theshuttle as it enters the box. If it enters as early asthc beck center itencounters a maximum resistance-"if it enters later because of delayedpick or Weak pick it encounters less and less resistance as the laymoves forward. By changing the spring adjustments the shuttle boxresistance may be changed. Thus in Fig. 4 is shown a diagramillustrative of rariations in box resistances secured by differentadjustments. A. point onone of the curves represents (1) the pressure onthe box by its height above the'datum line and the engular position ofthc crank by its distance FIOIlZl illQ zero point. Curve A shows theconditions of box pressure where the pres- ,iure on the box is a certainamount at the front center and increases to a greater emount at the backcenter and decreases again to the former amount at the front center. Thepick takes place, say, at the top center, and the shuttle arrives at theopposite box between the back center and the bottom centertbe later itarrives the less the pressure there is on it. Curve ii is one with thesome front center pressure as A but. with it higher back centerpressure-suitsble for a higher speed loom than curve A. Curve U is onewith a higher front center pressure and a lower lone-g center-p1*essnrcsuitable for a lower spec or lighter shuttle loom. From theforegoing it. will be seen that the pressure on. the shuttle may beadjusted at either end of the lay stroke to difierent amounts iii--depei'idently of adjustment of, the pressure at; the opposite end of thelay stroke.

in the position of the parts illustrated in Fig. l with the lay at itsback center, the spring; will be in its condition of greatestcompression, and as the lay moves forward, the pressure exerted by thespring on the binder will be less and. less, and a minimum at the frontcenter. Ordinarily the shuttle will be picked at the'top center, 'and asthe lay up pronches the back center, the pressure on the shuttle binderwill be greater and greater. Ordinarily the shuttle will reach the opposi'te box-between 210 and 240 of crank position, assuming zerocrankposition to be at front center. If, however, the shuttle is picked u ithgreater speed, it will be received in the box at an earlier time. andthe tension on the shuttle will be greatest at the back center. it theshuttle reaches-the opposite look after this point, the tension will becorrespondingly less, so that in case of a light pick and a slow movingshuttle, the tension on the shuttle box will be correspondinglydecreased. it will thus be apparent that from front center to backcenter the pressure on the shuttle box will gradually be into applyincreasing resistance to its rearward movement with the backwardmovement of the lay.

2. Shuti: box tension controlling mechanism for looms having, incombination, a lay. a shuttle box carried by the lay and provided with abinder on the rear side of the box, a rod attached at it forward. end tothe binder and slidingly supported at its rear end on a stationary partof the loom, and n yielding contrivance acting on the rod to applyincreasing resistance to its rear and movement with the backwardmovement of the lay, and decreasing pressure on the forward movement ofthe lay.

3. Shuttle box tension controlling mechanism for. looms having, incombination, a lay, a. shuttle box carried by the lay providedwith abinder on the rear side of the box, a rod attached at its forward end tothe binder and slidingly supported at its rear end on a stationary partof the loom, and a yielding contrivance acting on the rod. to applyincreasing resistance to the binder from the front center to the backcenter.

4. Shuttle box tension controlling mechanism tor looms having, incombination, a lay, a shuttle box cerried by the lay and provided with abinder on the rear side of the box, a.- rod attached at its forward endto the binder and slidingly supported at its rear end on a stationarypart of the loom, ands yielding contrivnnce acting on the rod to applydecreasing resistance to its rearward movement from the back center tothe front center.

5. Shuttle box tension controlling mechanism for looms having, incombination, a lay, a shuttle box carried by the lay and provided withebinder on the rear side of the 001:, e rod attached at its forward end.to the binder and slidingly sup-ported at its rear end on a stationarypart of the loom, u helical compression spring mounted on the rod, itsforward end engaging a port of the rod, and its rearward endengeging astationary part of the loom to apply increes 1 ,ev ses ing resistance tothe binder es the shuttle moves rearvvardly. I

6. Shuttle box tension controlling mechw nism for looms having, incombination, as

lay, a shuttle box carried by the lay andprovided with. a binder on therear side of the box, 9,; rod attached at its forward end to the binderand slidingly supported at its rear end on a stationary part of theloom, an abutment for the forward end of the spring secured to the rod,and s sleeve receivin the spring at its rear end which is rotatablysupported on a stationary part of the loom, such sleeve being providedwith teeth engaging the spring coils adapted to be screwed forward orback on'the spring to regulate the tension thereof, and means forlocking the sleeve in adjusting'position.

7. Shuttle box tension controlling mechanism for looms having, incombination, a lay, a shuttle box. and a friction deviw ecting on theshuttle in its box to retard its motion, and yielding means actingpermanently on the friction device with varying pressure depending uponthe position of the lay to increase the pressure as the lay approachesthebsek center and to decrease the pressure as the lay recedestherefrom. 8. Shuttle box tension controlling mechanism for loomshaving, in combinet1on,a.

lay, a shuttle box, a'friction device for refor the yielding means toincrease or del crease the pressure at eachend of the lay strokeindependently of modification of the pressure at the other end of thelay stroke.

9. Shuttle box tension controlling mechanism for looms having, incombination, 2. lay, a shuttle box, a friction device for retarding theshuttle as it enters the box, and yielding means permanently acting onthe friction device with varyingpressure depending upon the position ofthe lay to decreasethe friction exerted by the device as the lay recedesfrom the back center.

CLARE H. DRAPER.

